203820491461 has 4 divisors (see below), whose sum is σ = 210848784300. Its totient is φ = 196792198624.

The previous prime is 203820491383. The next prime is 203820491507. The reversal of 203820491461 is 164194028302.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 127016683236 + 76803808225 = 356394^2 + 277135^2 .

It is a cyclic number.

It is not a de Polignac number, because 203820491461 - 2¹¹ = 203820489413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203820491761) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3514146376 + ... + 3514146433.

It is an arithmetic number, because the mean of its divisors is an integer number (52712196075).

Almost surely, 2^203820491461 is an apocalyptic number.

It is an amenable number.

203820491461 is a deficient number, since it is larger than the sum of its proper divisors (7028292839).

203820491461 is an equidigital number, since it uses as much as digits as its factorization.

203820491461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7028292838.

The product of its (nonzero) digits is 82944, while the sum is 40.

The spelling of 203820491461 in words is "two hundred three billion, eight hundred twenty million, four hundred ninety-one thousand, four hundred sixty-one".